support older python: don't use dict comprehension


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/pathos@673 8bfda07e-5b16-0410-ab1d-fd04ec2748df
updated pp to 1.6.4.3; fixed: six bootstrap problem


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/pathos@674 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/pathos